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Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Servicing Asset at Amortized Cost [Line Items]      
Excess spread financing - fair value $ 934 $ 934  
Mortgage servicing rights financing - fair value 23 33  
Forward MSRs Sold      
Servicing Asset at Amortized Cost [Line Items]      
UPB 50   $ 40
Forward MSRs Sold, Subservicing Retained      
Servicing Asset at Amortized Cost [Line Items]      
UPB 0   $ 0
Reverse Mortgage Servicing Rights      
Servicing Asset at Amortized Cost [Line Items]      
Impairment 0    
HECM      
Servicing Asset at Amortized Cost [Line Items]      
UPB $ 17,269 $ 18,091